Bosch Double Iridium Spark Plugs Pack of 4 — OE-fit, ultra-fine iridium for longer life and reliable ignitability

BOSCH 9614 OE Fine Wire Double Iridium Spark Plugs are premium original-equipment-style ignition plugs built for longer life and reliable ignitability in modern gasoline engines.

These Bosch double iridium plugs combine an ultra-fine laser-welded iridium center electrode with an iridium ground-electrode inlay to improve ignition performance and durability versus standard copper plugs. Designed to match OE spark position and fit for many GDI and port-injected engines, they arrive pre-gapped at the factory so you can install them right away. Nickel-plated rolled threads resist corrosion and prevent galling for easier removal after service, and the robust construction helps them maintain consistent performance over time.

How do these plugs improve engine ignitability and efficiency?

The ultra-fine 360-degree laser-welded iridium center electrode lowers the voltage required to fire the spark, improving ignitability and supporting more complete combustion under a variety of conditions. That means crisper starts and more consistent spark delivery at higher RPMs and under load.

• Ultra-fine iridium firing pin reduces voltage needs up to 24%.
• Laser weld ensures stable spark gap and electrode positioning.
• Improved ignition consistency under varying engine loads.

What makes the double iridium design more durable than standard plugs?

Both the center electrode and a ground-electrode inlay use iridium — a very hard, wear-resistant metal — which increases service life and retains the critical gap geometry longer than softer materials. Bosch rates these plugs for roughly four times the longevity of typical copper plugs when used under comparable conditions.

• Iridium center electrode and iridium ground inlay resist erosion.
• Fine-wire geometry reduces electrode wear and energy loss.
• Maintains gap precision for extended maintenance intervals.

Are these plugs easy to install and do they need anti-seize?

BOSCH 9614 plugs come pre-gapped at the factory for correct installation without adjustment, saving installation time and reducing guesswork. Their nickel-plated rolled threads offer corrosion resistance and are engineered to avoid galling, so anti-seize compounds are not required during installation.

• Factory pre-gapped — ready to install out of the box.
• Nickel-plated rolled threads prevent corrosion and galling.
• No anti-seize needed, following Bosch installation guidelines.

Which vehicles and engine types are these spark plugs compatible with?

These Bosch OE-style double iridium plugs are manufactured to meet OEM fit, form, and function for many modern gasoline engines, including Gasoline Direct Injection systems. Fitment depends on the specific engine and model year, so verify compatibility with your vehicle using the fitment checker or vehicle application list.

• Engineered for compatibility with many GDI and port-injected engines.
• Common fitments include select Acura and Honda models (verify exact engine fitment).
• Sold in a pack of four for typical four-cylinder applications.

Who is this for: These BOSCH 9614 OE Fine Wire Double Iridium Spark Plugs are aimed at vehicle owners and technicians who want a long-lasting, OE-compatible ignition solution that improves ignitability without frequent replacement. They suit drivers of compatible Acura and Honda models, performance-minded DIYers, and service shops that value factory-style specifications and hassle-free installation. Always confirm fitment for your specific engine before purchasing to ensure proper match and performance.